A Massive Cluster of Red Supergiants at the Base of the Scutum-Crux Arm

  title={A Massive Cluster of Red Supergiants at the Base of the Scutum-Crux Arm},
  author={Ben Davies and Donald F. Figer and Rolf Peter Kudritzki and John W. MacKenty and Francisco Najarro and Artemio Herrero},
  journal={The Astrophysical Journal},
  pages={781 - 801}
We report on the unprecedented red supergiant (RSG) population of a massive young cluster, located at the base of the Scutum-Crux Galactic arm. We identify candidate cluster RSGs based on 2MASS photometry and medium-resolution spectroscopy. With follow-up high-resolution spectroscopy, we use CO band-head equivalent width and high-precision radial velocity measurements to identify a core grouping of 26 physically associated RSGs—the largest such cluster known to date. Using the stars' velocity… 

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